package com.ruoyi.common.utils.cxzfpay;

import cn.hutool.core.codec.Base64;
import com.alibaba.fastjson.JSONObject;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

/** */

/**
 * <p>
 * RSA公钥/私钥/签名工具包
 * </p>
 * <p>
 * 罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman）
 * </p>
 * <p>
 * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式<br/>
 * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，<br/>
 * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全
 * </p>
 * @date 2018-09-23
 */
public class RSAUtils {

    /** *//**
     * 加密算法RSA
     */
    public static final String KEY_ALGORITHM = "RSA";

    /** *//**
     * 签名算法
     */
    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /** *//**
     * 获取公钥的key
     */
    public static final String PUBLIC_KEY = "RSAPublicKey";

    /** *//**
     * 获取私钥的key
     */
    public static final String PRIVATE_KEY = "RSAPrivateKey";

    /** *//**
     * RSA最大加密明文大小
     */
    public static final int MAX_ENCRYPT_BLOCK = 117;

    /** *//**
     * RSA最大解密密文大小
     */
    public static final int MAX_DECRYPT_BLOCK = 128;

    /** *//**
     * <p>
     * 生成密钥对(公钥和私钥)
     * </p>
     *
     * @return
     * @throws Exception
     */
    public static Map<String, Object> genKeyPair() throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        keyPairGen.initialize(1024);
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        Map<String, Object> keyMap = new HashMap<String, Object>(2);
        keyMap.put(PUBLIC_KEY, publicKey);
        keyMap.put(PRIVATE_KEY, privateKey);
        return keyMap;
    }

    /** *//**
     * <p>
     * 用私钥对信息生成数字签名
     * </p>
     *
     * @param data 已加密数据
     * @param privateKey 私钥(BASE64编码)
     *
     * @return
     * @throws Exception
     */
    public static String sign(byte[] data, String privateKey) throws Exception {
        byte[] keyBytes = Base64.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateK);
        signature.update(data);
        return Base64.encode(signature.sign());
    }

    /** *//**
     * <p>
     * 校验数字签名
     * </p>
     *
     * @param data 已加密数据
     * @param publicKey 公钥(BASE64编码)
     * @param sign 数字签名
     *
     * @return
     * @throws Exception
     *
     */
    public static boolean verify(byte[] data, String publicKey, String sign)
            throws Exception {
        byte[] keyBytes = Base64.decode(publicKey);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PublicKey publicK = keyFactory.generatePublic(keySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initVerify(publicK);
        signature.update(data);
        return signature.verify(Base64.decode(sign));
    }

    /** *//**
     * <P>
     * 私钥解密
     * </p>
     *
     * @param encryptedData 已加密数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
            throws Exception {
        byte[] keyBytes = Base64.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, privateK);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        return decryptedData;
    }

    /** *//**
     * <p>
     * 公钥解密
     * </p>
     *
     * @param encryptedData 已加密数据
     * @param publicKey 公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
            throws Exception {
        byte[] keyBytes = Base64.decode(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, publicK);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        return decryptedData;
    }

    /** *//**
     * <p>
     * 公钥加密
     * </p>
     *
     * @param data 源数据
     * @param publicKey 公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPublicKey(byte[] data, String publicKey)
            throws Exception {
        byte[] keyBytes = Base64.decode(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        // 对数据加密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, publicK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        return encryptedData;
    }

    /** *//**
     * <p>
     * 私钥加密
     * </p>
     *
     * @param data 源数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
            throws Exception {
        byte[] keyBytes = Base64.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, privateK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        return encryptedData;
    }

    /** *//**
     * <p>
     * 获取私钥
     * </p>
     *
     * @param keyMap 密钥对
     * @return
     * @throws Exception
     */
    public static String getPrivateKey(Map<String, Object> keyMap)
            throws Exception {
        Key key = (Key) keyMap.get(PRIVATE_KEY);
        return Base64.encode(key.getEncoded());
    }

    /** *//**
     * <p>
     * 获取公钥
     * </p>
     *
     * @param keyMap 密钥对
     * @return
     * @throws Exception
     */
    public static String getPublicKey(Map<String, Object> keyMap)
            throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);
        return Base64.encode(key.getEncoded());
    }

    /**
     * 读取密钥文件
     * @param filePath
     * @param charSet
     * @return
     * @throws Exception
     */
    public static String readFile(String filePath, String charSet) throws Exception {
        FileInputStream fileInputStream = new FileInputStream(filePath);
        try {
            FileChannel fileChannel = fileInputStream.getChannel();
            ByteBuffer byteBuffer = ByteBuffer.allocate((int) fileChannel.size());
            fileChannel.read(byteBuffer);
            byteBuffer.flip();
            String keySet = new String(byteBuffer.array(), charSet);
            if (keySet.contains("-----BEGIN PRIVATE KEY-----")) {
                return keySet.replaceAll("-----\\w+ PRIVATE KEY-----", "");
            }else if (keySet.contains("-----BEGIN PUBLIC KEY-----")) {
                return keySet.replaceAll("\\-{5}[\\w\\s]+\\-{5}[\\r\\n|\\n]", "");
            }
            return new String(byteBuffer.array(), charSet);
        } finally {
            fileInputStream.close();
        }
    }



    public static void main(String[] args) throws Exception {
        String PT_PUB_KEY="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQClPf9o4EnHtz9ey0MliCNfPxSM9B7HZLe1mfb2fmn+1GVSHXLlQLyIeLc5VbtigQcloh8HorW7hPBhtw3tkLOgSa5nsAtKUQmk8RshVkJZ7CMGU9DnQXaXVyK6nWk3lRZ0iykaIkb3LvUSnEZdGlwXDXJlr4ZWRnvZwzpV6w77TQIDAQAB";
        String publickey ="MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQCPsTMt7RWswNBcA+ziiYJkgX9fepBNHJTSlEnI7IrRXK7LZDTlavjYVkdB6HlRa/ljpEeEJ4XOVJb1wjyrMfHby94cAMBnS/ZG7a/5xcA8mYWTFRsO1d49NCvPNvrIwsL8zE87cNEPHfZmVr38Y3mKtsMsfeSnsFoghz0QFqxGRQIBAw==";

        String pub="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCs/7dlAVxXQA7PnDeyt6aepa4FqnRUme6j/K8jH8e2SaB/ZgPv6debQsi8gH/o2BtVr1rCa1E1I7+uWWmmvxGmPJeOGCCamJyoGGfr4KDyfZzj89/HO4MY8zwRZQ/uh7y03JpxIe6rPeF8u6ouFW0w6rCp/Hxf/dpB4OmGq/X1eQIDAQAB";
        String privString="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";
        String sign="kztEd7zkd2Z+zJr+/qoGckI5BAoJfjh6c8+fWtw/s/iwh6YAf0yjKQ8Nn0EFJj7Y22LsQJq2clfMsVSXZkzmc2grDLmNLW5LliTNjVaDmXq9/T8OYuY5HTajvVYRPYcmCkqqsd9AAHHJzgoxaAzGpLjozIEtoPp7+njFyFmwvXo=";
        String amount="10.00";
        String orderNo="285303368870526976";
        String tradeNo="2018110222001406441005795272";
        String finshTime="20181102092136";
        String code="1000000";
        String merKey="JD20181030100557368";
        String orderStatus="1";
        String msg="SUCCESS";
        String jsonStr = "";
        JSONObject loginReq = new JSONObject();
        loginReq.put("MobileNumber","13950341396");
        loginReq.put("LoginPwd","123456");
        //公钥解密
        String loginStr = loginReq.toJSONString();

        String str=new String(encryptByPublicKey(loginStr.getBytes(), publickey));
        System.out.println("公钥解密=="+str);//公钥解密

        //生成数字签名
        String qming= RSAUtils.sign(Base64.decode(sign), privString);
        System.out.println("数字签名："+qming);

//		//验签名
        boolean boo= RSAUtils.verify(Base64.decode(sign), pub, qming);
        System.out.println(boo);











    }


































}
